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Some time in the mid-1990s, Kellogg's released a banana-flavoured version of its popular Rice Krispies cereal. Called Banana Bubbles, this lurid yellow breakfast went under the slogan: "The Cereal That Thinks It's A Milkshake".

The idea, as you've doubtless deduced, was that you got two treats in one: first, a delicious, banana-flavoured cereal and then, when you'd finished that, a delicious, banana-flavoured milkshake left in the bowl. Trouble was, though indeed a cereal that thought it was a milkshake, Banana Bubbles was unfortunately a virtually inedible cereal that incorrectly thought it was a drinkable milkshake.